Improvement in machines for pulping wood for paper-stock



BENJAMIN F. BARMER, OF CURTISVILLE, MASSACHUSETTS.

IMPROVEMENT IN MACHINESl FOR PULPING WOO FGR PAPER-STOCK, Sac.

Specification forming part of Letters Patent No. 119,107, dated September 19, 1871.

To all whom it may concern:

Be it known that I, BENJAMIN F. BARKER, of Gurtisville, in the county of Berkshire and State of Massachusetts, have invented a new and Improved Wood-Pulping Machine; and I do hereby declare-that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing forming a part of this specification, in which- Figure l represents a vertical section of my improved wood-pulping machine, the line c c indicating the plane of section. Fig; 2 is aplan or top. view, partly in section, of the same. Fig. 3 is a detail side view, partly in section, of the grindstone and attachments.

Similar letters of reference indicate correspond ing parts.

This invention relates to improvements in machinery for converting Wood into pulp for use in the production of paper, and has for its object to insure the proper action of all parts and simplify their construction and the arrangement of drivin gmechanism.- The invention consists in a new form of stone, whereby centrifugal force is utilized for retaining the wood in contact with the grinding-surface a longer time than it otherwise would remain. The invention also consist-s in the use of adjustable guides, whereby the blocks of wood areheld to and caused to be fed against the grinding-surface in the desired manner. The invention also consists in an attachment for grinding spljnters and small pieces apart from the larger blocks, but on the same stone and in a new general Vcombination of parts, as hereinafter more fully described.

A in the drawing represents the frame ofl my improved wood-pulp machine. B is the vertical shaft, journaled in the frame A and carrying the grindstone C, which is fastened to it in suitable manner. Rotary motion is imparted to the shaft and stone by suitable means. To the lower face of the stone C is secured, by bolts or screws a a, a metal plate, D, which projects beyond the periphery of the stone to constitute a ilange, as shown. The stone is made slightly conical, being somewhat larger in diameter at the top than bottom. E is a case afiixed stationary to the frame A to surround the stone, its inner'face being parallel with the inclined edge of the stone. The flange D extends under the lower edge of the inclosing-case E, and forms thus the bottom of the annular space between C and E. F F are tapering blocks or frames fitted against the inner side of the case E, and provided with projecting ears b on their outer sides that pass through slots in the shell E. Screws G G, swiveled in the frame A and working in said ears b, serve to adjust the tapering blocks in such manner as to carry their larger ends nearer to or further away from the edge Aof the stone. To the inner face of the shell E are rigidly affixed sheet-metal plates H H, as many as there are blocks F. Every plate H is curved so as to partly cover the inner side of a block, F, the point of said wedge-shaped block iitting between the inner side of the shell and the plate H, as is clearly shown in Fig. 2. From where the plate H is fastened to the shell it extends away from the block F in shape of a hook, d, which is carried near to the edge of the stone. into this hook d, so as to be at first free from contact with the stone; but as such wood rests on the plate D, which revolves withthe stone toward the large end of the block F, the wood is carried along by the plate D until it is tightly wedged in between the stone and block F. The revolving stone is then in convenient position for grinding the wood and feeding it ahead until it is entirely used up. The thick end of the block F is kept close to the stone, so that all the wood may be ground,

and as the stone is worn the block is set to follow it by means of the screw G. The flange D serves as a constant automatic feeder, carrying the wood along in the triangular space between the block F and the stone. The hook d on the plate H constitutes a convenient receptacle for letting the wood clear down before it is being ground. The slightly-inverted conical shape of the stone causes the stone to be crowded upward by-centrifugal force, and produces, owing to its The block of wood to be ground is placed L, having inclined bucketsheped plates ff, is suspended above the grindstone G by means of e screw or bolt, g. The Wood is put upon these plates f, and on theln, by its own Weight, gradually fed to the upper grindingince of the stone. Both the top and the circumference ofthe stone are thus used for grinding.

Having thus described my invention, what I claim as new, and desire to secure by Letters Potent, is-

l. The grindstone C of a Wood-pulp machine, provided with e slightlydnclined grinding-edge, substantially as und for the purpose herein shown and described.

2. The plate D, affixed to the bottoni of the grndstone and projecting beyond the circumference of the saine, to constitute u rotating bottom specified.

BENJAMIN F. BARKER.

Witnesses:

H. M. BUNALL,

Trios. S. PEIRCE. (81.) 

